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chore(tools): Add `debug_jp` profiling and trace tools (#670)

Add a new `debug_jp_*` tool family to the project tooling that lets the
assistant profile and trace `jp` commands in a sandboxed environment.
Three tools are introduced:

- `debug_jp_profile_sampling` — wall-clock profiling via macOS
`sample(1)`, with demangled call-graph output rendered as a Markdown
report. Parses the indented thread trees, reconstructs ancestry chains
across branches, and aggregates hot leaves.

- `debug_jp_profile_heap` — dhat heap profiling, built with the `dhat`
Cargo feature. Parses the resulting JSON, strips allocator/stdlib
dispatch noise from call stacks, and renders headline stats plus hot
leaves and stacks tables.

- `debug_jp_trace` — `JP_DEBUG=1` trace log capture. Launches `jp` with
the tracing layer active, retrieves the JSONL log, and renders it in a
compact logfmt-like format with level/target/grep filtering and
run-collapsing for repeated events.

All three tools share a common harness (`debug_jp/util/`):

- `sandbox` — RAII-managed isolated environment: a detached `git
worktree` with uncommitted changes applied, plus a scratch
`JP_USER_DATA_DIR`. Supports optional copy-on-write cloning of the real
user data via `reflink_or_copy` (macOS `clonefile(2)` fast path,
per-file fallback otherwise).

- `build` — `cargo build --profile profiling` runner that resolves the
binary path via `cargo metadata`.

- `launch` — two-phase spawn/wait abstraction exposing the child PID so
`sample(1)` can attach between the two phases.

Tool definitions are added in `.jp/mcp/tools/debug_jp/` with all three
tools disabled by default (`enable = false`) and `run = "ask"`.

---------

Signed-off-by: Jean Mertz <git@jeanmertz.comu>
Signed-off-by: Jean Mertz <git@jeanmertz.com>

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